1 files changed, 144 insertions, 0 deletions
diff --git a/qpid/java/broker/src/test/java/org/apache/qpid/server/stats/StatisticsCounterTest.java b/qpid/java/broker/src/test/java/org/apache/qpid/server/stats/StatisticsCounterTest.java
new file mode 100644
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+++ b/qpid/java/broker/src/test/java/org/apache/qpid/server/stats/StatisticsCounterTest.java
@@ -0,0 +1,144 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.server.stats;
+
+import junit.framework.TestCase;
+
+/**
+ * Unit tests for the {@link StatisticsCounter} class.
+ */
+public class StatisticsCounterTest extends TestCase
+{
+    /**
+     * Check that statistics counters are created correctly.
+     */
+    public void testCreate()
+    {
+        long before = System.currentTimeMillis();
+        StatisticsCounter counter = new StatisticsCounter("name", 1234L);
+        long after = System.currentTimeMillis();
+        
+        assertTrue(before <= counter.getStart());
+        assertTrue(after >= counter.getStart());
+        assertTrue(counter.getName().startsWith("name-"));
+        assertEquals(1234L, counter.getPeriod());
+    }
+ 
+    /**
+     * Check that totals add up correctly.
+     */
+    public void testTotal()
+    {
+        StatisticsCounter counter = new StatisticsCounter("test", 1000L);
+        long start = counter.getStart();
+        for (int i = 0; i < 100; i++)
+        {
+            counter.registerEvent(i, start + i);
+        }
+        assertEquals(99 * 50, counter.getTotal()); // cf. Gauss
+    }
+ 
+    /**
+     * Test totals add up correctly even when messages are delivered
+     * out-of-order.
+     */
+    public void testTotalOutOfOrder()
+    {
+        StatisticsCounter counter = new StatisticsCounter("test", 1000L);
+        long start = counter.getStart();
+        assertEquals(0, counter.getTotal());
+        counter.registerEvent(10, start + 2500);
+        assertEquals(10, counter.getTotal());
+        counter.registerEvent(20, start + 1500);
+        assertEquals(30, counter.getTotal());
+        counter.registerEvent(10, start + 500);
+        assertEquals(40, counter.getTotal());
+    }
+ 
+    /**
+     * Test that the peak rate is reported correctly.
+     */
+    public void testPeak() throws Exception
+    {
+        StatisticsCounter counter = new StatisticsCounter("test", 1000L);
+        long start = counter.getStart();
+        assertEquals(0.0, counter.getPeak());
+        Thread.sleep(500);
+        counter.registerEvent(1000, start + 500);
+        Thread.sleep(1000);
+        assertEquals(1000.0, counter.getPeak());
+        counter.registerEvent(2000, start + 1500);
+        Thread.sleep(1000);
+        assertEquals(2000.0, counter.getPeak());
+        counter.registerEvent(1000, start + 2500);
+        Thread.sleep(1000);
+        assertEquals(2000.0, counter.getPeak());
+    }
+ 
+    /**
+     * Test that peak rate is reported correctly for out-of-order messages,
+     * and the total is also unaffected.
+     */
+    public void testPeakOutOfOrder() throws Exception
+    {
+        StatisticsCounter counter = new StatisticsCounter("test", 1000L);
+        long start = counter.getStart();
+        assertEquals(0.0, counter.getPeak());
+        counter.registerEvent(1000, start + 2500);
+        Thread.sleep(1500);
+        assertEquals(0.0, counter.getPeak());
+        counter.registerEvent(2000, start + 1500);
+        Thread.sleep(1000L);
+        assertEquals(0.0, counter.getPeak());
+        counter.registerEvent(1000, start + 500);
+        Thread.sleep(1500);
+        assertEquals(4000.0, counter.getPeak());
+        Thread.sleep(2000);
+        assertEquals(4000.0, counter.getPeak());
+        counter.registerEvent(1000, start + 500);
+        assertEquals(4000.0, counter.getPeak());
+        Thread.sleep(2000);
+        counter.registerEvent(1000);
+        assertEquals(4000.0, counter.getPeak());
+        assertEquals(6000, counter.getTotal());
+    }
+ 
+    /**
+     * Test the current rate is generated correctly.
+     */
+    public void testRate() throws Exception
+    {
+        StatisticsCounter counter = new StatisticsCounter("test", 1000L);
+        assertEquals(0.0, counter.getRate());
+        Thread.sleep(500);
+        counter.registerEvent(1000);
+        Thread.sleep(1000);
+        assertEquals(1000.0, counter.getRate());
+        counter.registerEvent(2000);
+        Thread.sleep(1000);
+        assertEquals(2000.0, counter.getRate());
+        counter.registerEvent(1000);
+        Thread.sleep(1000);
+        assertEquals(1000.0, counter.getRate());
+        Thread.sleep(1000);
+        assertEquals(0.0, counter.getRate());
+    }
+}